RF-driven azimuthal spin waves in a 300 nm vortex nanopillar support multiple steady-state gyration radii, each producing a distinct Floquet frequency comb, so the device can be hysteretic.
Nontrivial Aharonov-Bohm effect and alternating dispersion of magnons in cone-state ferromagnetic rings
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abstract
Soft magnetic dots in the form of thin rings have unique topological properties. They can be in a vortex state with no vortex core. Here, we study the magnon modes of such systems both analytically and numerically. In an external magnetic field, magnetic rings are characterized by easy-cone magnetization and shows a giant splitting of doublets for modes with the opposite value of the azimuthal mode quantum number. The effect of the splitting can be refereed as a magnon analog of the topology-induced Aharonov-Bohm effect. For this we develop an analytical theory to describe the non-monotonic dependence of the mode frequencies on the azimuthal mode number, influenced by the balance between the local exchange and non-local dipole interactions.
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Excitation of vortex core gyration in nanopillars through driven Floquet magnons
RF-driven azimuthal spin waves in a 300 nm vortex nanopillar support multiple steady-state gyration radii, each producing a distinct Floquet frequency comb, so the device can be hysteretic.